context-with-timeout-consuming-time.go

package main

import (
	"context"
	"fmt"
	"time"
)

func sleepHalfTheTime(ctx context.Context, total time.Duration) {
	time.Sleep(total >> 1)
}

func doSomethingUntilContextExpieration(ctx context.Context) {
	start := time.Now()
	defer func() {
		fmt.Printf("ELAPSED: %s\n", time.Now().Sub(start))
	}()

	<-ctx.Done()
}

func main() {
	total := 10 * time.Second

	ctx, _ := context.WithTimeout(context.TODO(), 10*time.Second)

	sleepHalfTheTime(ctx, total)
	doSomethingUntilContextExpieration(ctx)
}

gistfile1.txt

ELAPSED: 5.000082213s